Year	Tonnes
1958	3.667
1959	7.334
1960	44.004
1961	91.675
1962	84.341
1963	88.008
1964	110.01
1965	102.676
1966	102.676
1967	102.676
1968	102.676
1969	121.011
1970	143.013
1971	150.347
1972	161.348
1973	168.682
1974	205.352
1975	220.02
1976	209.019
1977	249.356
1978	348.365
1979	407.037
1980	432.706
1981	557.384
1982	575.719
1983	594.054
1984	465.709
1985	476.71
1986	480.377
1987	517.047
1988	553.717
1989	821.408
1990	583.053
1991	627.057
1992	630.724
1993	627.057
1994	645.392
1995	627.057
1996	707.731
1997	806.74
1998	861.745
1999	931.418
2000	1041.428
2001	997.424
2002	1004.758
2003	1078.098
2004	1103.767
2005	1125.769
2006	1360.457
2007	1646.483
2008	1917.841
2009	1932.509
2010	1961.845
2011	2211.201
2012	2629.239
2013	3058.278
2014	2849.259